Current MediaWiki handling of vertical whitespace is a bug, plain and
simple. Someday it'll bug me enough to learn PHP to fix it.
Multiple
blank lines in the source should not mean multiple blank lines in the
output. I support hacks to fix really ugly cases, but I think here
the solution is to fix the code, not make the articles an ugly mess
to
work around it.
As far as the extra blanks line for each category line, there is a very
simple patch that seems to correct this available at
bugzilla.wikipedia.org, only waiting for someone with access to
implement it.
-Rich Holton
(en.wikipedia:User:Rholton)
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